I did an update for the SBAMAT board. This board is a breakout board for the ADG728.
The ADG728 is a CMOS analog matrix switch with a serially controlled 2-wire interface. It is an 8-channel matrix switch. On resistance is closely matched between switches and very flat over the full signal range. This part can operate equally well as a multiplexer, demultiplexer or switch array and the input signal range extends to the supplies.
If you need a neat analog mux this board is great for prototyping. If you would like to build your own board the gerbers are here Gerbers SBAMAT.